diff --git a/Cargo.lock b/Cargo.lock
index 8abf997..69ac3ed 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -32,6 +32,7 @@ version = "0.1.0"
 dependencies = [
  "aoc_proc",
  "color-eyre",
+ "lru-cache",
  "peg",
  "petgraph",
  "regex",
@@ -228,6 +229,12 @@ version = "0.2.137"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fc7fcc620a3bff7cdd7a365be3376c97191aeaccc2a603e600951e452615bf89"
 
+[[package]]
+name = "linked-hash-map"
+version = "0.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0717cef1bc8b636c6e1c1bbdefc09e6322da8a9321966e8928ef80d20f7f770f"
+
 [[package]]
 name = "log"
 version = "0.4.17"
@@ -237,6 +244,15 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "lru-cache"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "31e24f1ad8321ca0e8a1e0ac13f23cb668e6f5466c2c57319f6a5cf1cc8e3b1c"
+dependencies = [
+ "linked-hash-map",
+]
+
 [[package]]
 name = "memchr"
 version = "2.5.0"
diff --git a/Cargo.toml b/Cargo.toml
index 5334162..a3ff1bb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,6 +8,9 @@ edition = "2021"
 [workspace]
 members = ["aoc_proc"]
 
+[profile.release]
+opt-level = 3
+
 [dependencies]
 color-eyre = "0.6.2"
 aoc_proc = { path = "aoc_proc" }
@@ -16,3 +19,4 @@ time = "0.3.17"
 regex = "1.7.0"
 petgraph = "0.6.2"
 peg = "0.8.1"
+lru-cache = "0.1.2"